package collection;

import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;

public class CollectionDemo2 {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        //Collection c = new HashSet();
        c.add(new Point(1,2));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(7,8));
        c.add(new Point(9,10));
        System.out.println(c);
        c.add(new Point(1,2));//此时未重写equals方法，默认逻辑仍为==，地址不同，所以能放入set集合中
        System.out.println(c);
        c.add(new Point(3,4));
        System.out.println(c);

        Point p2 = new Point(3,4);
        boolean contains = c.contains(p2);//contains本质调用equals方法比较
        System.out.println(contains);

        c.remove(p2);
        System.out.println(c);

    }
}
